Minimizing the energy consumed by buildings is of great interest because of stringent state and federal regulations, LEED green-building-certification-system requirements, and ever-increasing energy costs. One way to decrease energy consumption is to recover heat from the air exhausted from buildings. Many heat-recovery devices are available. They include:
Air-to-air heat exchangers with metal walls.
Air-to-air heat exchangers with permeable walls.
Heat wheels.
Enthalpy ...

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